diff --git a/Gemfile.lock b/Gemfile.lock
index ae45624..604b098 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    locport (1.2.1)
+    locport (1.3.0)
       thor (~> 1.3)
 
 GEM
diff --git a/README.md b/README.md
index 946c362..451467b 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,22 @@ locport list
 
 If any conflicts are detected, they will be displayed and program exits with error code 1.
 
+### Looking up a port by address
+
+```sh
+locport port ADDRESS
+```
+
+Examples:
+
+```sh
+locport port alpha.localhost
+locport port http://alpha.localhost
+```
+
+Lookup compares addresses after removing a leading `http://` prefix from both sides.
+If no address is found, command exits with code 1 and produces empty output.
+
 ### Adding existing projects to the index
 
 ```sh
diff --git a/lib/locport.rb b/lib/locport.rb
index 67610f8..7a00012 100644
--- a/lib/locport.rb
+++ b/lib/locport.rb
@@ -45,6 +45,14 @@ def add(host = "#{File.basename(Dir.pwd)}.localhost")
       say "added ✓", :green
     end
 
+    desc "port ADDRESS", "Print the indexed port for an address"
+    def port(address)
+      found_port = indexer.port_for_address(address)
+      return say(found_port) if found_port
+
+      exit 1
+    end
+
     desc "list", "List indexed projects, hosts and ports"
     def list
       indexer.projects.each do |dir, addresses|
diff --git a/lib/locport/indexer.rb b/lib/locport/indexer.rb
index 27a366a..2038b29 100644
--- a/lib/locport/indexer.rb
+++ b/lib/locport/indexer.rb
@@ -123,6 +123,14 @@ def append_address_to_dotfile(address, dir: Dir.pwd)
       save
     end
 
+    def port_for_address(value)
+      normalized_value = normalize_http_address(value)
+
+      addresses.find do |address|
+        normalize_http_address(address.host) == normalized_value
+      end&.port
+    end
+
     def storage_path
       File.join storage_dir, DATA_FILE
     end
@@ -174,5 +182,9 @@ def find_unused_port
           return port unless @addresses.any? { |address| address.port == port } || port_listening?(port)
         end
       end
+
+      def normalize_http_address(value)
+        value.to_s.delete_prefix("http://")
+      end
   end
 end
diff --git a/locport.gemspec b/locport.gemspec
index e7fdde1..29f4a9d 100644
--- a/locport.gemspec
+++ b/locport.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name        = "locport"
-  spec.version     = "1.2.1"
+  spec.version     = "1.3.0"
   spec.summary     = "localhost port management"
   spec.description = "Overview of localhost ports used across projects. Prevent conflicts."
   spec.authors     = ["Robert Starsi"]
diff --git a/test/locport/indexer_test.rb b/test/locport/indexer_test.rb
index e221394..3df1705 100644
--- a/test/locport/indexer_test.rb
+++ b/test/locport/indexer_test.rb
@@ -99,6 +99,19 @@ def test_port_open
       refute @indexer.port_listening?(port)
     end
 
+    def test_port_for_address
+      @indexer.index(@projects_path, recursive: true)
+      @indexer.load_projects
+
+      assert_equal 30000, @indexer.port_for_address("http://alpha.localhost")
+      assert_equal 30000, @indexer.port_for_address("alpha.localhost")
+      assert_equal 30001, @indexer.port_for_address("http://conflict.localhost")
+      assert_equal 30001, @indexer.port_for_address("conflict.localhost")
+      assert_nil @indexer.port_for_address("http://alpha.localhost/foo")
+      assert_nil @indexer.port_for_address("missing.localhost")
+      assert_nil @indexer.port_for_address(nil)
+    end
+
     def test_create_address_without_conflicts
       dir = Dir.mktmpdir
 
diff --git a/test/locport_main_test.rb b/test/locport_main_test.rb
index 6f6feb9..59e22b5 100644
--- a/test/locport_main_test.rb
+++ b/test/locport_main_test.rb
@@ -4,4 +4,42 @@ class LocportMainTest < Minitest::Test
   def test_default_task_is_list
     assert_equal "list", Locport::Main.default_task
   end
+
+  def test_port_prints_port_when_found
+    indexer = Minitest::Mock.new
+    indexer.expect :port_for_address, 30000, ["https://alpha.localhost/foo"]
+    main = build_main(indexer)
+
+    out, err = capture_io do
+      main.port("https://alpha.localhost/foo")
+    end
+
+    assert_equal "30000\n", out
+    assert_empty err
+    indexer.verify
+  end
+
+  def test_port_exits_with_non_zero_and_empty_output_when_not_found
+    indexer = Minitest::Mock.new
+    indexer.expect :port_for_address, nil, ["https://missing.localhost"]
+    main = build_main(indexer)
+
+    out, err = capture_io do
+      error = assert_raises(SystemExit) do
+        main.port("https://missing.localhost")
+      end
+      assert_equal 1, error.status
+    end
+
+    assert_empty out
+    assert_empty err
+    indexer.verify
+  end
+
+  private
+    def build_main(indexer)
+      main = Locport::Main.new
+      main.define_singleton_method(:indexer) { indexer }
+      main
+    end
 end